Deep well pump



2 Sheetshsheet 1 lnventor l Czdries SJYaz'on, Bfv @M0 @0112@ #may KimmC. S. NATION DEEP WELL: PUMP Feb. 27', 1945.

Filed April 1, 1944 I 2 Sheets-Sheet 2 I mlenta'r By am daiszm WWPatented Feb. 27, 1945 UNITED STATES PATENT l2 ,370An l oFFicE 3VClaims.

'rms invention relates to 1mprovements in deep well pumps of the kindcommonly used in oil wells, and the primary object of the presentinvention is to provide a deep well pump of the ejector type, whereingas under `pressure is pumped into the well between the well casing andthe tubing and nally discharged through a jet nozzle in an upwarddirection into the well tubing for drawing the oil upwardly and forcingit through the tubing to the surface.

An important object of the present invention is to provide a deep wellpump of the above type which is comparatively simple in construction andhighly eflcient in operation, and by means of which the many dicultiesand objections of a mechanical pump operated from the surface areovercome.

Another object of the `present invention is t'o provide an ejector pumpfor deep wells which may be readily lowered into the well or pulledtherefrom, and wherein lowering of the pump into the well conditions itfor use by automatically expanding the packer into engagement with thewell casing subsequent to contact of the bottom strainer section of thepump with the bottom of the well.

Other objects and advantages of the invention will become apparent fromthe following description when considered in connection with theaccompanying drawings, and the invention consists in the novel form,combination and arrangement of parts hereinafter more fully described,shown in the drawings and claimed.

In the drawings, wherein like reference characters indicatecorresponding `parts throughout the several views:

Figure 1 is a fragmentary view partly broken away, partly in verticalsection, kand partly in elevation, showing a deep well pump embodyingthe present invention operatively positioned within a well casing.

Figure 2 is an enlarged fragmentary vertical section taken on the planeof line 2-2 of Fig-- ure 1, and partly broken away.

Figure 3 is a fragmentary vertical section, taken on the plane of line 33 of Figure 1.

Figure 4 is a horizontal section taken on line 4-4 of Figure. A

Figure 5 is a fragmentary vertical section through the ejector proper,taken on the plane of line 5-5 of Figure 3.

Figure 6 is a somewhat diagrammatic view illustrating the manner ofoperating the present pump whenused in an oil Well.

Referring in detail to the drawings, Sindicates tted on the tubing I andwelded to the, latter, as

at I0. The collar 9 has a depending annular flange I I which isundercutto retainingly receive the upper end of the packer tube1I2`which consists of a flexible elastic member fitted .onA thek sleeve 8.Slidable on. the sleeve 8 and arranged to abut the lower end of thepacker tube I2 is the lower packer collar I3 into which is threadedtheupper end of` a strainer section I4 whose lower portion isprovided withAthe usual side perfora tions I5 to admit the oil therein. The lower endloi` packer sleeve 8 is enlarged, as at I6, so as toY abut the lowercollar I3 and limit upward movement of the sleeve 8, collar Sand tube I2relative to said collar I3. It will be apparentthatwhen the tubingr 'Iis lifted it will elevate the partsll, Bvl

and I2 until the enlarged lower end-of sleeve 8: engages the collar I3:and causes the` latter'- andthe strainer section I4 to also be elevated.Thus, the structure may be pulled as a unit' from the. well in aconvenient manner because this opera.-

tion causes collapsing of the packer tube I2 out ot engagement with thewell casing 5. On the other. hand, when the tubing I and partscarredthere-` by are lowered, the bottom end of strainer section` I.4 willengage the bottom of they well, and cause upward movement of the lowerpacker collar I3=to y ultimately compress and expand the packer tube I2outwardly into engagement with the casing, therebysealing the spacebetween the casing 5 and tubing 'l adjacent the lower end of the latter,so that oil may not flow upwardly between the casing 5 and tubing labove the packer.

As indicated by dotted lines in Figurey 1` and shown more clearly inFiguresZ and 3J` the tub-4 ing l projects below the'jpacker butterminates some distance above the bottom of the strainer section I4.Threaded onto the-lower end of tubing 'l is the casing I'I of anejector.. This ejector casing is formed with a transverse passage I 8..vtherethrough that communicates at its ends withv thespace between thestrainer section I4 and the lower `end of tubing .1. The passage I8 isopen. at the top at a point intermediate its .ends so. as.`

to communicate with a jet nozzle. I9 that isdetachably threaded inplace, as at 20; to facilitate its renewal. This jet nozzle projectsupwardly and has a passage therethrough that tapers smaller in an upwarddirection, as indicated at 2I. Also, the nozzle I9 projects at its upperend into the central upwardly tapering passage of a bushing 22 that istted in the lower end of tubing 1 and is clamped in place between thelower end of said tubing 'I and an internal shoulder provided in theejector casing I1, as at 23. It will be further noted that the casing I1is provided with longitudinal passages 24 at opposite sides of thetransverse passage I8 so as to afford communication between the openupper and lower ends of casing II. Thus, gas under pressure escapingfrom the nozzle I9 will flow upwardly at -a very rapid speed and thenquickly expand,

producing a suction in the passages 24 and drawing the oil upwardly tothe tubing 'I and then forcing the oil through said tubing to thesurface. This gas, which is pumped into the casing between the latterand the 'tubing 1, passes through passages 25 in the upper packer collar9 into the space between the tubing 1 and packer sleeve 8, so that itmay ultimately pass into the transverse passage I8. In passingdownwardly into the well, the compressed gas is cooled, and when itescapes from the nozzle I9, the sudden expansion causes further coolingso that any oil entrained in the gas will be liquied and precipitated soas to combine with the oil being pumped froml the well,

As shown more clearly in Figure 3, the ejector casing I'I is providedwith a series of packing cups 26 on the exterior thereof below thepassage I8, and these packing cups tightly engage the inner surface ofthe strainer section I4 so as to prevent the gas from passing downwardlybetween the parts I4 and I'I to any material distance below the passageI 8. Accordingly, this gas must pass from the space between tubing I andstrainer section I4 into the passage I8 for ultimate discharge throughnozzle vI9 upwardly into tubing l. The packing cups 26 are preferablyspaced by means of rings 21 fitted on the lower end portion of casingI'I between said packing cups, and the assembly is maintained in placeupon casing I1 by suitable securing and jamb nuts, as at 28. A suitableinlet pipe of relatively short length may be threaded into the lower endof casing I l, as indicated at 29, and secured in place by a jamb nut 3Uthreaded thereon and against the lower end of casing I1. This inlet pipe29 of casing I'I secures a removable valve seat 3I in place within thecasing I1 below the passage I8,

and cooperating with seat 3I is a gravity-seated ball check valve 32.When the oil is drawn upwardly and forced into the tubing l, the ball 32will be elevated to permit the passage of the oil, but when the supplyof gas under pressure is discontinued, the ball valve 32 willautomatically seat so as to prevent oil from flowing downwardly from thetubing 1 after it has been elevated above the valve 32.

In using the present pump in connection with oil wells which afford aconsiderable supply of gas, such gas may be utilized as the pumpingmedium. Suchutilization of gas may be accomplished by passing the oilthrough a separator 33, as shown in Figure 6, and conducting theseparated gas by means of pipe 34 to a pump 35 operated by a motor 36,the pump forcing the compressed gas through pipe 31 into the spacebetween the well casing 5 and tubing 1 near the surface of the well.

lIt will be readily apparent that a pump of the present kind may beoperated a. great deal more economically and eillciently than mechanicalpumps operated from the surface. It will also be seen that operation ofthe pump causes liquefaction of gasoline entrained in the gas utilizedto lift the oil from the well. There is only one working part consistingof the check valve 32, so that continued operation without the need ofreplacing parts is made possible. The abrasive action of any sand forcedthrough the bushing 22 may be partly overcome by making such bushing ofspecial wear-resisting material. While I have shown and described onemanner of installing the ejector in the construction of a well pump, itis noted that other methods of installation are possible, and their usewill depend upon the particular conditions met with in the operation ofa well. A decided advantage of the present invention is the completeabsence of working parts such as traveling valves, sucker rods and thelike.

What I claim is:

l. A pump for a deep well having a casing therein, comprising a tubingextended into the well, a packer on the tubing above the lower end ofthe latter and engageable with the casing, a strainer section suspendedfrom the lower end of the packer and movable upwardly for expanding thelatter into engagement with the casing, said packer being in spacedsurrounding relation to the tubing and having gas-admission passagesthrough the upper end thereof for permitting passage of gas underpressure from the space between the casing and the tubing to the spacebetween the `tubing and the packer, an ejector including a casingattached to the lower end ofthe tubing and having a downwardly seatingcheck valve in the lower portion thereof, said ejector casing being freeof the strainer section, said ejector casing having a transverse passagetherethrough communicating at its ends with the space between the packerand the tubing and being open at the top intermediate the ends of thesame, an ejector nozzle communieating with the top opening andprojecting upwardly toward the tubing, passages at opposite sides ofsaid transverse passage alfording communication between the upper andlower ends of the ejector casing, and packing means carried by theejector casing below said transverse passage and engaging the innersurface of the strainer section.

2. In a deep well pump,` a tubing, a packer including an'upper collarfixed to the tubing 'above the lower end of the latter and havinggasadmission passages therethrough, a packer sleeve rigidly attached atits upper end to said upper collar and disposed in spaced surroundingrelation to the tubing, said passages communicating with the spacebetween said packer sleeve and said tubing, a packer tube attached toand depending from the upper packer collar and tted on said packersleeve, a lower packer collar slidable on said packer sleeve andarranged to abut the lower end of said packer tube, a strainer sectionattached at its upper end to said lower packer collar and surroundingand depending below the tubing so that lowering of the latter aftercontact of the strainer section with the bottom of thewell will causeupward movement of the lower packer collar and expansion of the packertube outwardly for engagement with a Well casing, an yejector attachedto the lower end of the tubing and including a casing provided with aninlet and having a `iet nozzle projecting upwardly toward the tubing soas to discharge into the lower end of the latter, and packing meanscarried by said ejector casing below said inlet and engaging the innersurface of the strainer section.

3. In a deep well pump, a tubing, a packer including an upper collar Xedto the tubing above the lower end of the latter and having gas-admissionpassages therethrough, a packer sleeve rigidly attached at its upper endto said upper collar and disposed in spaced surrounding relation to thetubing, said Apassages, communicating with the space between said packersleeve and said tubing, a packer tube attached to and depending from theupper packer collar and tted on said packer sleeve, a lower packercollar slidable on said packer sleeve and arranged to abut the lower endof said packer tube, a strainer section attached at its upper end tosaid lower packer collar and surrounding and depending below the tubingso that lowering of the latter after contact of the strainer sectionwith the bottom of the well will cause upper movement of the lowerpacker collar and expansion of the packer tube outwardly for engagementwith a well casing, an ejector attached to the lower end of the tubingand including a jet nozzle projecting upwardly toward the tubing so asto discharge into the lower end d'1 the latter, said ejector including acasing and packing cups 0n said ejector casing engaging the innersurface of the strainer section, said ejector casing having a transversepassage communicating at its ends with the space between the tubing andthe .strainer section above said packing cups and opening into said jetnozzle.

' CHARLES S. NATION.

